Timothy kennedy



T. KENNEDY, MACHINE FOR TURNING HEADS 0F SCREWS.

No. 65,394. Patented June 4, 1867.

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TIMOTHY KENNEDY, OF HAMDEN, ASSIGNOR TO THOMAS KENNEDY, OF

- BRANFORD, CONNECTICUT.

Letters Patent No. 65,394,:Zated June 4, 1867.

IMPROVED MACHINE FOR TURNING THE HEADS OF SCREWS.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, TIMoTHr KENNEDY, of Hamden, in the county of New Haven, and State of Connecticut, have invented a new Improvement in Machine for Shaving Screw-Heads; and I do hereby declare the following, when taken in connection with the accompanying drawings, and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure 1, a front view.

Figure 2, a side view.

Figures?! and 4, the operation of the machine; and in Figures 5 and 6, the formation of the cutter.

. This invention is designed more particularly for shaving the heads of carriage-bolts, but is alike applicable to all kinds of screws, its object being to .finish the head with greater facility than has heretofore been done, and consists, first, in the peculiar formation of the cutter, and secondly, in the mechanism which operates the cutter.

To enable others skilled in the art to construct and use, my invention, 1 will proceed to describe the same as illustrated in the accompanying drawings.

I will first describe the construction of the cutter, as seen in figs. 5 and 6. I first form a ring of steel, as seen in fig. 5, and turn out the inside surface to the form required for shaving one-half the diameter of the screw-head, as seen in fig. 6, there shown as'for turning the common oval head. This ring I then cutin segments, as denoted by the red lines, fig. 5, then temper the several segments, and each segment forms a cutter for my machine. The cheupness and simplicity of th s manner of forming the cutter aretoo apparent. to require more to be said..

I will now proceed to describe the mechanism in which this peculiar cutter is used. A is the bed-plate, B

the cutter-holder, supported. upon a mandrel, C, which has its bearing at D D. In the face of the holder B is formed a. circular channel to receive the cutter E, the said channel corresponding to the circle of the cutter, and having its centreeccentric to the centre of the mandrel C, so that when the holder is moved in its bearings the movement of the cutter is in a circle corresponding to its own radius, as from the position in fig. 3 to that in fig. 2, the centre of motion of the said cutter being eccentric to the centre from which the channel inwhich the cutter B is placed is described, and is thus moved by a cam, F, on a shaft, G, supported so as to revolve in bearings-H. From the cutter-holder B projects an arm, I, through which passes a screw, J, its lower end resting on a shoe, K, on the cam F, so that when the cam Fis'tnrncd, as from the position in fig. 2 to that in fig. 3, the arm I rises and forces the cutter forward, as seen in fig. 3. Continuing its revolution the cam returns to the position seen in fig. 2, and with it the cutter to it's first position. L is atnhc, supported in hearing M, into which the blank a is placed to he turned. The cutter before heinginscrted intothc holder is first ground so as to form a sharp or cutting edge upon the inucr or concave edge of the cutter, as seen in fig. 4, and placed in the holder -B, where it is secured by adjusting-screws (Z; and to properly set the cutter place a finished blank, a, into the tube, as seen in fig.'4, then raise the cutter-holder to its highest point,'as seen in fig; 3, and when so raised the lower point of the cutter should rest at the centre of the head, as seen in figs. 3 and at. At that point secure the cutter in its holder and the machine is ready for use, and its operation is as follows:

. Place the blank to be turned in the tube, where it may be held by any known device and caused torevolve', and when so revolving turn the cam F up to the position seen in fig. 3, which brings the cutter in contact with the revolving head, and shoves therefrom the surplus metal and nicely finishes the head. The cutter'is then withdrawn by the continued movement of the cam, the shaved 'blank removed, a second inserted, and so on.

By this peculiar formation of the cutter, and its operation, the cutter is made to share, and not scrape the head, whereby the durability of the cutter is very much increased, and the operation of the mechanism is so easy and positive that although the cutter may he somewhat dulled it will still answer the purposc'intended, whereas by the common method the cutter can only be used so long as itis actually sharp, so much power being required to force the cutter. Thus I add to the simplicity and durability of the cutter the advantage of shaving a greater number of heads without grinding or re-adjusting the cutter, than has heretofore been done.

I do not wish to he understood as broadly claiming the construction of cutters by first forming a ring and'then cutting in segments, as this has before been done, but the cutting edge has always been on the outer edge of the circle, in which case it simply scrapes and does not shave.

Having thus fully described my intention, uhat I claim as new and useful, and desire to secure by Letters Patent, is--- v '1; The combination of the cutter-holder B with the cutter E and-the cam F, constructed and arranged so as to operate substantially in the manner herein set forth. H I

2. The combination of the segmental cutter E, having its cutting edge formed as deseribed,-"with the holder B, said holder being arranged to more the said cutter around a central point into cutting position, substantially as herein set forth. v

' TIMOTHY KENNEDY.

; Witncssesp Joan H. Snumwnr, A. J. Tmmrs. 

